diff --git a/_constraints b/_constraints
index 29a0b63..ee329e3 100644
--- a/_constraints
+++ b/_constraints
@@ -2,14 +2,27 @@
 <constraints>
   <sandbox>kvm</sandbox>
   <hardware>
-    <memory>
+    <!-- processors doesn't actually ... get you that many threads. Sigh -->
+    <!-- request number of jobs instead (6 is max on ppc/s390x) -->
+    <jobs>6</jobs>
+    <physicalmemory>
       <size unit="G">8</size>
-    </memory>
+    </physicalmemory>
+    <disk>
+      <!-- Needed when we may need to bundle llvm -->
+      <size unit="G">30</size>
+    </disk>
   </hardware>
+  <!-- aarch64:  X-Gene cpus are the only ones that work as there is a bug in others - select -->
+  <!--  12G of ram to ensure these are what's used. -->
   <overwrite>
     <conditions>
-      <arch>i586</arch>
-      <arch>x86_64</arch>
+      <arch>aarch64</arch>
     </conditions>
+    <hardware>
+      <physicalmemory>
+        <size unit="G">12</size>
+      </physicalmemory>
+    </hardware>
   </overwrite>
 </constraints>
diff --git a/julia.changes b/julia.changes
index 0db3be7..a1f5a80 100644
--- a/julia.changes
+++ b/julia.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Dec 11 06:45:55 UTC 2023 - Soc Virnyl Estela <uncomfy+openbuildservice@uncomfyhalomacro.pl>
+
+- Copied constraints from Rust. Both languages love memory that much.
+
 -------------------------------------------------------------------
 Mon Dec 11 06:37:37 UTC 2023 - Soc Virnyl Estela <uncomfy+openbuildservice@uncomfyhalomacro.pl>